The grammar in readme.md throws errors.

[stellamazeika]

There are two major problems with the code as written:

First, there is no "animal" symbol in the grammar.
Second, tracery errors out if one leaves a symbol unpopped at the end of its expansion.

(ie, instead of the current Origin symbol:

"origin" : ["[mainCharacter:#name# the #animal.capitalize#][destination:#place#]#story#[mainCharacter:pop]"

we need to have:

"origin" : ["[mainCharacter:#name# the #animal.capitalize#][destination:#place#]#story#[mainCharacter:pop][destination:pop]"

The other solution would be allow the current format to exist without erroring out - or a way of just saying "pop all of the things that have been pushed")

[hugovk]

The example at the top of the README now works:

{
    "name": ["Arjun","Yuuma","Darcy","Mia","Chiaki","Izzi","Azra","Lina"],
    "animal": ["unicorn","raven","sparrow","scorpion","coyote","eagle","owl","lizard","zebra","duck","kitten"],
    "mood": ["vexed","indignant","impassioned","wistful","astute","courteous"],
    "story": ["#hero# traveled with her pet #heroPet#.  #hero# was never #mood#, for the #heroPet# was always too #mood#."],
    "origin": ["#[hero:#name#][heroPet:#animal#]story#"]
}

test

I've created PR #27 to add quotes around the symbols in the examples at the end of the README.